Abstract
The aim of this study is to prepare CuO–CeO2 composite by means of mechanical milling and to investigate its characteristics as a catalyst. The structural and morphological features of milled samples are observed by X-ray diffractometry and scanning electron microscopy. The redox property and total OSC (oxygen storage capacity) of the milled sample were measured by using GC-TCD and TG-DTA, which are important parameters to indicate the effectiveness of catalysts. Interestingly, reduction of CuO is repeatedly observed when milling of CuO–CeO2 powder mixture is processed in air. The redox property of milled CuO–CeO2 sample is investigated by H2-TPR, where three reduction peaks are observed for 0 h milling and only one broad peak for various other milling times. The total OSC of mechanically driven CuO–CeO2 catalyst is much higher than that of the CeO2–ZrO2 traditional catalyst system at low temperatures.
Highlights
Nowadays, more than 95% of vehicles produced are equipped with a catalytic converter [1]
The primary aim of this study is to characterize the CeO2–CuO mixed oxides prepared by high-energy mechanical milling and evaluate the Oxygen storage capacity (OSC) properties, which is compared with CeO2 –ZrO2 traditional catalysts prepared under the same experimental conditions
There is no change in the observed phase of CeO2 up to 30 h milling, the peak broadening with milling is significant, during the early milling stages regarding the change of the peak shape
Summary
More than 95% of vehicles produced are equipped with a catalytic converter [1]. The three-way catalysts (TWCs), used for the gasoline-fuelled engine are capable of simultaneously converting CO, hydrocarbon (HC) and NOx, with a stoichiometric air-to-fuel ratio (A/F 1⁄4 14.7), into harmless CO2, H2O and N2 [1]. Oxygen storage capacity (OSC) is one of the crucial factors for the performance of TWCs. The CeO2–ZrO2 composite is well known as an excellent promoter of OSC, where CeO2 exhibits the oxygen storage/release behaviour by redox variation of Ce ions between Ce3þ and Ce4þ, while the introduction of ZrO2 into CeO2 improves the reduction temperature of ceria through structural modification of the ceria lattice [2], the OSCs at low.
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